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  • Outlook cannot read the calendar

    Home Forums AskWoody support Microsoft Office by version Office 365 and Click-to-Run Outlook cannot read the calendar

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      • #2355941
        AskWoody Plus

        Yesterday Outlook (Microsoft 365 home premium) was working fine.  Today when I opened Outlook, it said “cannot read the calendar,” even though it actually could, as I determined by looking through the calendar.  Opening Outlook with the /safe parameter did not get the error initially but clicking on the Calendar icon results in the error, even though the calendar can actually be read as before.  The only add-ons installed are Microsoft’s own.  Also, near as I can tell, there were neither Office nor Windows updates applied over night.  The data file is not the culprit because it opens just fine when copied to my laptop and opened with Outlook there.  I uninstalled Microsoft 365 with the Microsoft Support and Recovery Assistant, then re-booted and re-installed Microsoft 365.  The first time I opened Outlook, the error did not recur, but it recurred on every subsequent time.  I’m baffled and at loss to know what to try next.

      • #2355958
        AskWoody MVP

        Try CalCheck?

        CalCheck is a program that checks your Outlook calendar for problems, and performs various checks on general settings, such as permissions, free/busy publishing, delegate configuration, and automatic booking. Then, each item in your calendar folder is checked for known problems that can cause unexpected behavior, such as meetings that seem to be missing.

        Resolve Outlook for Windows issues with automated troubleshooting tools

        • #2355975
          AskWoody Plus

          I wouldn’t expect CalCheck to fix the problem because (1) there is no error if I move the PST file to my laptop and open with Outlook there and (2) even on my desktop, after the error shows, Outlook displays the calendar just fine.

      • #2355960
        AskWoody MVP

        You mentioned using Microsoft Support and Recovery Assistant to remove Office 365.

        Did you also use that tool to fix Outlook problems, “I’m having problems with my calendar”?

        • #2355974
          AskWoody Plus

          No, just to re-install Office.  First opening of Outlook was fine.  Subsequent openings got the “cannot read calendar” error again.  So far, not fixed.

      • #2356262
        AskWoody Plus

        After banging my head against the wall, trying various things, I decided AskWoody MVP “B” undoubtedly knows a lot more than I do, so I decided to try CalCheck.  I’m getting an error message that is Greek to me:

        ERROR: , Code: 0x8004010F, Function OpenMessageStoreGUID(lpMAPISession, pbExchangeProviderPrimaryUserGuid, &lpMDB), File CalCheck.cpp, Line 470
        ERROR: Could not connect. Ensure you are connecting Outlook via MAPI to an Exchange server.

        I don’t have an Exchange server, just Office locally installed.  B, can you give me a clue what I”m doing wrong.  TIA

      • #2356534

        I have the same problem.  Outlook (Office 365) JUST DID AN UPDATE!!

        Update 16.0.13901.20336

        I am very sure this is the problem.

        I tested this buy creating a new PST file and copied the exported calendar to the new PST and the SAME error happens.

        Poor quality on MSFT’s part!

        • #2356536
          AskWoody MVP

          I’ve been using build 13901.20336 for a week but I haven’t seen any calendar error.

          Could you explain why you created a new PST to reproduce it?

          (I think I’m probably missing something.)

        • #2356569
          Susan Bradley

          Tasks for the weekend – April 10, 2021 – change your Office @ AskWoody

          Have you tried rolling yourself to semi-annual enterprise version? See the link I posted.

          Susan Bradley Patch Lady

        • #2356744
          AskWoody Plus

          My calendar problem is occurring in version .13901.20148, apparently an earlier version.

          • #2356769
            AskWoody MVP

            Doesn’t that mean that you’re signed up for the Current (Preview) Channel, but you haven’t received the last five updates over the last month?

            (Only the Preview channel received that build, and it was released on March 11th.)

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